Looking for some guidance on controlling cheap RadioShack rotator

Bought a $55 special TV rotator from my local Radio Shack, and I would like
to use something to control Azimuth (Elevation is obviously fixed, I have it
at 30 degrees which seems OK for my use). It has three screw posts
(probably +/- DC voltage and ground for motor control?)
I have an older PC with a parallel port (serial port is used to control the
rig). What pre-existing interfaces between parallel port and the screw
posts of the rotator are available? I don't have the time to build my own
kit, and would rather buy off-the-shelf solution.
Thanks.
Mark Lunday
WD4ELG
wd4elg@arrl.net
http://wd4elg.net
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